Ancient Footprints Reveal When Giant Flying Reptiles Took to the Ground
[html]Learn how fossil footprints prove pterosaurs walked the Earth long before they vanished from the sky.[/html]
Source: Ancient Footprints Reveal When Giant Flying Reptiles Took to the Ground (http://ht**://www.discovermagazine.c**/the-sciences/ancient-footprints-reveal-when-giant-flying-reptiles-took-to-the-ground)